<%= link_to_remote 'Reveal all comments', {:update => "comments_list",
    :after => "insertWaitingImg('comments_list')",
    :url => {:controller => "comments", :action => "reveal_comments", :commentable_id => @commentable, :commentable_type => @commentable.class },
    :complete => remote_function(:update => 'hide_reveal_comments',:after => "insertWaitingImg('hide_reveal_comments')", :url => {:controller => 'comments', :action => 'hide_comment_btn', :commentable_id => @commentable , :commentable_type => @commentable.class })
    } 
%> 